Tunning
Tunning 
11-12-2012, 12:54 PM
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This gets covered pretty frequently. The quick answer is about 95% of the time a tune isn't mandatory for exhaust and a lid. You might run kind of rich and your gas mileage will suffer if it's a DD, but you shouldn't really hurt anything. It just won't run the best it can and net the most gain until you get a tune.
